130 PHYLLOCELETOPTEBUS GRACILIS. 



it ventrally is the torus for the hooks. Posterior region has also biramous feet, with 

 slender dorsal bristles and ventral hooks. 



Tubes for the most part translucent and ringed, and in the case of a budding form 

 recently described by Mr. Potts are branched. 



De Quatrefages (1865) was of opinion that this genus and Spiochxtopterus were 

 identical. 



Claparede (1868) points out that the presence of the second pair of tentacles 

 distinguishes Phyllochdetopterus from Spioeh'defopterus, though the two genera closely 

 approach each other. 



1. Phyllooeletopterus gracilis, 1 Grube, 1863. Plate Oil, fig. 6 — 6 6— bristles and hook; 

 Plate CVIII, fig. 15 — tooth-like spine of fourth segment. 



Specific Characters. — Anterior region with the buccal funnel somewhat like that of 

 Chddtopterus variopedatus, but a grooved ridge runs backward in the mid-dorsal line, the 

 ridge having a swelling or " boss " in front. The palpi are absent (from injury), and just 

 behind is a small and somewhat clavate tentacle. A median band runs along the convex 

 dorsum of the muscular region, whilst ventrally a whitish band and a whitish transversely 

 elongated area behind enliven the surface. Ten pairs of well-marked feet in the anterior 

 region, the first directed forward, each with a row of bristles with thin, flattened spear- 

 shaped tips. The fourth foot is larger than the others, and bears ventrally a single 

 powerful chitinous bristle resembling a long molar tooth ; beyond it is a short row of the 

 bristles with the flattened hastate tips. Hooks unknown. Eleventh bristled segment (first 

 of the second region) has two dorsal branchias, with an even margin internally and a 

 slightly enlarged tip, the external border having a crenate process or branch. A flattened 

 lobe on the lateral region below it ; ventrally is the transverse pad for the hooks (which 

 are absent in the example). 



Synonyms. 



1863. Phyllochxtopterus gracilis, Grube. Archiv f . Naturges., Bd. xxix, p. 52, Taf. v, fig. 4. 



1868. „ „ Claparede. Annel. Nap., p. 345. 



1881. „ „ Langerhans. Canarisch. Annel., p. 114, Taf. v, fig. 19. 



Habitat— Dredged in the ' Porcupine ' Expedition of 1870 in 81 fathoms off Cape 

 Finisterre. 



A fragment, scarcely fth of an inch in length and about |th of an inch broad, of the 

 anterior region of a form that at first sight most nearly approaches Olaparede's genus 

 Banzania, seeing that no long tentacles are present, but their absence is probably due to 

 injury and therefore it may be P. gracilis. The snout resembles that of the common 

 Ghsetopterus variopedatus, for the lower lip is less prominent, but the presence of two 



1 This differs from P. socialis, which has thirteen bristled segments in the anterior region, and 

 the posterior region commences at the twenty-fourth, and has thirty-five segments. The tubes are 

 grouped and transparent. 



